Electronic Principles
A high-pass filter:

None of these
passes lower-frequency signals and reduces higher-frequency signals
passes higher-frequency signals and reduces lower-frequency signals
increases the level of all frequencies by a significant amount
has no effect on ac signals

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Electronic Principles
Current is

The flow of charged particles through a material
The force that causes electrons to flow
An imbalance of electrical charges
None of these
The number of free electrons in an atom

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